Head unit and amp RCA question

Ive got a question about my pre-amp outs on my HU.

I've got 3 preamp outs on my head unit. Front,rear,sub. I'm going to be joking up a 4 channel amp,which has 4 RCA inputs, and a mono sub amp,which has 2 RCA inputs. The question is,do I use RCA Y Adapters since I only have 3 outputs on my head unit and 6 inputs between both amps?

 

You have enough pre amp outputs to do the job. You will have a red/white pair for the front, rear, and sub on the HU. You will hook the front pair to the front INPUT on your four channel amp and do the same for the rear into the REAR input on the amp. Same for the sub. You don't use the outputs on the amps in this case.

 

The head unit is a,Pioneer DEH-P4900iB. I do not have a 2 RCA outputs for each front,rear,sub. Just 1 output for each one.

 

You are right. There are 6 outputs. I just got in from work and took the head unit out to take a look. I had it out before,to remove the satellite radio. It was at an angle,because I didn't disconnect the harnesses. I only seen the 3 outputs. Sorry to have wasted anyone's time. I greatly appreciate the help,thanks!!!